Drag for molding-flasks.



" W. FAWGETT.

DRAG FOB. MOLDING I'LASKS.

APPLICATION FILED AUG. 19, 1909.

6? Patented Feb. 1, 1910.

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WILLIAM FA'W'CETT, OF ST. LOUIS, MISSOURI.

DRAG FOR MOLDING-FLASKS.

Specification of Letters Patent.

Patented Feb. I, 1910.

Application filed August 19, 1909. Serial No. 513,579.

To all whom it may concern:

Be it known that I, VVILLIAM Fnwon'r'r, a citizen of the United Statesof America, residing in the city of St. Louis and State of Missouri,have invented certain new and useful Improvements in Drags for Molding-Flasks, of which the following is a full, clear, and exact description,reference being had to the accompanying drawings, forming part of thisspecification.

y improvement relates to a new and useful improvement in drags formolding flasks, the prime object of the invention being to provide adrag whereby the bottom board or follower employed in ordinary styles ofdrags is dispensed with. The boards or followers referred to are alwaysobjectionable for the reason that after they have been used a few times,they become buckled or warped, due to heat in the molding flasks, and,conse quently, no longer present even surfaces for contact with thebottom edges of the drag. This unevenness, obviously, permits the sandwhich is contained in the drag to fall or be elevated at various points,resulting in imperfect castings.

In the drawing, I have illustrated my improved drag associated with anordinary cope and chill of a flask designed for casting car wheels, theassemblage being shown for the purpose of giving a comprehensiveunderstanding of the utility of the invention.

Figure I is a vertical section of a flask having my drag therein, andillustrating the condition of the flask assembly after the drag has beenfilled and tamped with sand, preparatory to being inverted. Fig. II is atop or plan view of the flask. Fig. III is a side elevation of theflask, on a reduced scale in inverted position.

A designates the cope of a flask and A the chill, these members beingshown in the drawing as being formed integral one with the other.

B designates a pattern, which is preferably supported by the chill A,which is provided with core prints 6 and b.

C designates my improved drag as an entirety which rests, when ready toreceive sand, upon the chill A. This drag consists of a hollow bodyhaving a bottom 1, which merges into the wall 2 by suitable curvedportions 3, thus rendering the drag practically saucer shaped. In thecenter of the drag is a vent for gases formed in an inwardly projectingboss 5, which merges from the bottom wall 1 of the drag, said vent lbeing directly in line with the core print Z) carried by the pattern 13.

t3 designates a plurality of ribs arranged within the concavity of thedrag, and extending preferably radially from the boss 5 to the sidewalls 2, the ribs being integral with the bottom wall 1.

Formed in the bottom 1 of the drag and located preferably between theaforesaid ribs 6 are openings 7, the combined areas of which areconsiderably less than the area of the interior of the drag. Theseopenings 7 are located centrally of the drag and may be of any desiredshape, but being preferably of segmental shape.

8 designates a plurality of vents in the bottom of the drag, to permitof the escape of gases arising from the molten substance when pouredinto the flask in the process of castlng.

9 designates a plurality of vents, which preferably extend through theribs 6 and are located directly in line with the core prints 6 on thepattern B.

The chill and cope, as well as my improved drag, are provided withtrunnions a and 0, respectively, designed to be engaged by suitabledevices for raising, lowering and otherwise manipulating the same, as iswell understood. The drag G is also provided with lugs, or projections,O which afi'ord seats for suitable clamps. The cope or chill is alsoprovided with the usual centering pins or dowels, A which register withper- (fiorations formed in lugs 0 carried by the rag.

In the practical use of a flask comprising my drag, the pattern B isfirst placed in proper position on the cope. The drag is then placedover the cope and securely clamped thereto, after which the flask as anentirety is turned downside up, and, if desired, placed upon a suitablesupport D, ready to have the cope rammed with sand in the ordinarymanner. It will be clearly understood that, due to the construction ofthe drag, the sand will not fall from the drag through the restrictedopenings 7 when the drag is in the reversed position just described, andthat the ordinary bottom plate commonly employed to retain the sand inthe drag is dispensed with.

I claim:

1. A. drag for molding flasks of a deep concave saucer shape having inits bottom,

for the passage of sand therethrough, an opening that is of less areathan the area at the interior of the drag, thereby providing for thebottom of the drag holding sand packed in the drag.

2. A drag for molding flasks of a deep concave saucer shape having inits bottom, for the passage of sand therethrough, a plurality ofopenings of less area than the area at the interior of the drag, therebyproviding for the bottom of the drag holding sand packed in the drag.

3. A drag for molding flasks of a deep concave saucer shape having inits bottom, for the passage of sand therethrough, a plurality ofopenings located aside from the center of the drag, of less area thanthe area at the interior of the drag, thereby providing for the bottomof the drag holding sand packed in the drag.

t. A drag for molding flasks of a deep concave saucer shape, comprisingan outer bottom portion and a central bottom portion spaced apart fromeach other to provide openings through the bottom of the drag for thepassage of sand therethrough, the outer and central portions beingconnected to each other.

5. A drag for molding flasks of a deep concave saucer shape, comprislngan outer bottom portion and a central bottom portion spaced apart fromeach other to provide openings through the bottom of the drag for thepassage of sand therethrough, the outer and central portions beingconnected to each other, and the central portion being provided at itsinner face with a boss.

6. A drag of a deep concave saucer shape, comprising an outer bottomportion, a central bottom portion, and ribs connecting said outer bottomportion to said central bottom portion, the bottom of the drag beingopen between said outer bottom portion and central bottom portion andbetween said ribs.

7. A drag of a deep concave saucer shape VILLIAM FAVVCETT.

In the presence of- HOWARD Gr. Coon, EDNA B. LINN.

